Hornblende biotite granite photomicrograph cross polarized

Hornblende is common in many intrusive igneous rocks ranging from granite to gabbro it is also present in medium grade metamorphosed mafic rocks Hornblende occurs in some volcanic rocks but it is less abundant in extrusive rocks than in intrusive rocks

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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: biotite, cross, granite, hornblende, photomicrograph, polarized